webpack.config.js

const UglifyJsPlugin = require("uglifyjs-webpack-plugin");
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const OptimizeCSSAssetsPlugin = require("optimize-css-assets-webpack-plugin");
const path = require('path')

module.exports = {
  mode: 'production',
  entry: {
    index: [path.join(__dirname, 'src/index.js')],
  },
  optimization: {
    minimizer: [
      new UglifyJsPlugin({
        cache: true,
        parallel: true,
        sourceMap: true // set to true if you want JS source maps
      }),
      new OptimizeCSSAssetsPlugin({})
    ]
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: "react-leaflet-search.min.css",
    })
  ],
  externals: [
    {
      leaflet: {
        amd: 'leaflet',
        commonjs: 'leaflet',
        commonjs2: 'leaflet',
        root: 'L'
      }
    },
    {
      'react-leaflet': {
        amd: 'react-leaflet',
        commonjs: 'react-leaflet',
        commonjs2: 'react-leaflet'
      }
    },
    {
      react: {
        amd: 'react',
        commonjs: 'react',
        commonjs2: 'react',
        root: 'React'
      }
    }
  ],
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        loader: 'babel-loader',
      }, {
        test: /\.css$/,
        use: [
            MiniCssExtractPlugin.loader,
            'css-loader',
        ]
      }
    ],
  },
  output: {
    filename: 'react-leaflet-search.min.js',
    library: 'ReactLeaflet',
    libraryTarget: 'umd'
  },
  serve: {
    content: [__dirname],
    port: 8080,
  },
}